The only President who was neither elected as President nor as Vice President was Gerald R. Ford.
He was the first elected President, several men held the office of President before him but none of them were elected.
John Adams
No. His first elected position was President of the US. He did not seek an elected office after that.
YES
John Tyler
John Quincy Adams
Thomas Jefferson (1801)
John Tyler is the first United States President to take office following the death of an elected President. He replaced William Henry Harrison, who died on April 4, 1841
Ronald Reagan was 69 when first elected President in 1980; he was 73 when elected to his second term of office.
He was elected in 1840 and took office in 1841. but he died a month after he was elected.
John Quincy Adams
John Quincy Adams